For me it was probably adding the Inkbird temperature controller with a small clip on fan for cooling purposes. I was struggling with temperature fluctuations this summer going from 77 to upwards of 82 at times. Once I added the Inkbird and the fan, it has kept my tank between 76.5 and 77.5 at all times. It's also nice knowing that I have a backup shutoff for my heater in case it gets stuck in the on position. The temperature stability made a world of difference for the corals.
A close second would probably be the small refugium I added in the second chamber with the inTank fuge basket and IM Chaetomax fuge light. I was struggling with high nitrates (30ppm+) and the fuge has brought them down and kept them stable at around 5ppm.
A close second would probably be the small refugium I added in the second chamber with the inTank fuge basket and IM Chaetomax fuge light. I was struggling with high nitrates (30ppm+) and the fuge has brought them down and kept them stable at around 5ppm.